Download The Components of a Computer

INTRODUCTION
TO COMPUTERS
Evolution of
the Computer
FIRST GENERATION (1940-1956)
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Huge, slow, expensive and often unreliable.
In 1946, two Americans, Presper Eckert and Willian Mauchly build
the ENIAC (Electronic Numerical Integrator and Computer).
It use vacuum tube instead of mechanical switches of the MARK 1.
Vacuum tube
MARK 1
Presper Eckert
Willian Mauchly
SECOND GENERATION (1956-1963)
The famous computer scientists during the second generation era :

Transistor was small devices use to transfer electronic signals
across a resister.
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Transistors had many advantages compared to other hardware
technology.
THIRD GENERATION (1964-1971)
IBM 370 series were introduced in 1964.
Other models
 CDC 7600
 B2500.
FOURTH GENERATION (1971-PRESENT)
 It took only 55 years for the 4 generations to evolve.
Steve Jobs
Bill Gates
Micheal Dell
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There are many types of computer models such as:
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Apple Macintosh
IBM
DELL
ACER
1971 Intel created the first microprocessor.
1976, Steve Jobs built the first Apple computer.
1981, IBM introduced its first personal computer.
FIFTH GENERATION (PRESENT & BEYOND)
Technologically advance and are still being
development to become more efficient.
Other modern computer devices:
• silicone chips
• processor
• robotics
• virtual reality
• intelligent systems
• programs which translate languages
Types of Computers
Super Computers
Mini Computers
Mainframe Computers

MICRO COMPUTER

WORK STATION
COMPUTER PARTS
AND COMPONENTS
A keyboard is an example of input
device for text input.
•A monitor is an output device that can
be used to display text.
•It can display graphics and video.
•It is similar to a television set that
accepts video signals from a computer
and displays information on its screen.
A mouse is also an input device
but it is called a pointing device
used to input data that is
continuous and multi-dimensional
into a computer.
A pair of speakers is an audio
output device that generates
sound.
A printer is an output device that can
be used to print text, apart from
graphics, on mediums such as paper,
transparency film or even cloths.
Computer System
INPUT
Hardware used to enter data and instructions
PROCESS
information
STORAGE :Holds data, instructions, and
for future use
OUTPUT
Output Hardware that conveys information to one or more people
Data processing cycle of the computer system
Input
Process
Storage
Output
SYSTEM UNIT
System Unit
 Case that contains electronic components of the
computer used to process data
-
Sometimes called
the chassis
INPUT/OUTPUT PORT(I/O PORT)
RESET BUTTON
The Components of a Computer
 Flat, round, portable metal disc

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CD-ROM
DVD-ROM
Compact Disc
The Components of a Computer
Floppy Disk Drive
Function :
The Components of a Computer
Hard Disk Drive
FUNCTION :
Motherboard

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Main circuit
board in system
unit
Also called
system board
Central Processing Unit (CPU)
 Interprets
and carries
out basic instructions
that operate a computer
 Control unit directs and
coordinates operations in
computer
 Arithmetic logic unit
(ALU) performs
arithmetic, comparison,
and logical operations
 Also
Processor
Control
Unit
Arithmetic
Logic Unit (ALU)
Instructions
Data
Information
Input
Devices
called the processor
Data
Memory
Instructions
Data
Information
Storage
Devices
Information
Output
Devices
Random Access Memory (RAM)
Memory chips that can be
read from and written
to by processor
Also called
main memory
or primary
storage
Most RAM is
volatile, it is lost
when computer’s
power is
turned off
The more RAM a
computer has, the
faster it responds
Read-Only Memory (ROM)
Memory chips that store
permanent data
and instructions
Nonvolatile memory, it is not
lost when computer’s
power is turned off
EEPROM
(electrically
Three types:
erasable programmable
read-only memory)—
Firmware—
Type of PROM
Manufactured with
containing microcode
PROM
permanently written
programmer
data, instructions, (programmable
can erase
read-only
or information
memory)—
Blank ROM
chip onto which
a programmer
can write permanently
Expansion Slot
 An opening, or socket,
on the motherboard
that can hold an
adapter card
 With Plug and Play,
the computer
automatically
configures cards
and other devices
as you install them
PERIPHERALS
PERIPHERAL DEVICES

External hardware devices attached
to the computer are called peripheral
equipments.
TYPES OF PERIPHERAL

INPUT DEVICES
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OUTPUT DEVICES
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STORAGE DEVICES
The Components of a Computer
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
What is an input device?
Hardware used to enter data and instructions
INPUT

Input is any data or instruction that you enter
into the memory of a computer.
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There are four types of input: which are text,
graphic, audio and video.
 Input
device is any hardware component that
allows users to enter data and instructions
a) INPUT DEVICES FOR TEXTS

You can enter data such as text and
commands into a computer by pressing
the keys on the keyboard.
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You can press the keys of a
virtual keyboard on the screen.
An optical reader uses a light
source to read characters, marks
and codes and then converts them
into digital data.
b) INPUT DEVICES FOR GRAPHICS

A scanner will captures images
from photographic prints, posters,
magazine pages and similar
sources for computer editing and
display.
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A digital camera allows you to take
pictures and store the photographed
images digitally.
c) INPUT DEVICES FOR AUDIO

Audio input is the speech, music and sound
effects entered into the computer.
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The example of input devices such as a
microphone and digital musical instruments
like the Musical Instrument Digital Interface
(MIDI) keyboard.
d) INPUT DEVICES FOR VIDEO

A Closed-Circuit Television (CCTV)
video camera enables a home or small
business user to capture video and images.
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A webcam is any video camera that
displays its output on a web page.
A digital video camera allows you
to record full motion and store the
captured motion digitally.
e) POINTING DEVICES

Pointing devices such as a mouse, trackball,
graphics tablet and touch screen are used to
input spatial data into the computer.
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Spatial data refers to data that is continuous
and multi-dimensional.
The Components of a Computer
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What is an output device?
Hardware that conveys information to one or more people
OUTPUT

Output is the result of data processing activity
when it is presented external to the system.
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There are four types of output, which are:
 Output
device is hardware that is capable of
delivering or showing information.
TYPES OF OUTPUT DEVICES

A monitor can be used to display text, graphics
and video. It is similar to a television
set that accepts video signals from
a computer and displays information
on its screen.
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A printer can be used to prints text
and graphics on a physical medium
such as paper or transparency film
or even cloths.
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A photo printer is a colour
printer that produces
photo-lab-quality pictures.
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An image setter can transfer
electronic text and graphics
directly to film, plates, or
photo-sensitive paper.
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A pair of speakers is an audio
output device that generates sound.
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The headphone is a pair of
small speakers placed over the
ears and plugged into a port on
the sound card.
A woofer or subwoofer is used
to boost the low bass sound and
is connected to the port on the
sound card.
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A Liquid Crystal Display (LCD)
projector uses its own light source
to project what is displayed on the
computer on a wall or projection
screen.
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A digital light processing (DLP)
projector uses tiny mirrors to
reflect light which can be seen
clearly in a well-lit room.
STORAGE

Information and documents are stored in
computer storage so that it can be retrieved
whenever they are needed later on.
 Computer
storage is the holding of data in an
electromagnetic form for access by a computer
processor.
FUNCTIONS OF COMPUTER STORAGE
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Store programs and data to be used at a later
time.
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Useful to keep current data while being
processed by the processor until the
information is saved in a storage media such as
a hard disk or a diskette.
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It also stores instructions from
a computer program.
TYPES OF COMPUTER STORAGE
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Primary storage is known as the main
memory of a computer, including RAM
(Random-Access Memory) and ROM (ReadOnly Memory).
It is an internal memory (inside the CPU) that
can be accessed directly by the processor.
DIFFERENCES BETWEEN
RAM AND ROM
RAM
ROM
Data and
program
Stores during
and after
processing
Stored by
manufacturer
Content
Stores
information
temporarily
Stores instructions
(Information)
permanently
Processing
time
Very fast, but
uses a lot
of power
Volatile
Fast, but uses very
little power
Volatility
Non-volatile
TYPES OF COMPUTER STORAGE

Secondary storage is the alternative storage
in a computer.
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It is an external storage that refers to various
ways a computer can store program and data.
SECONDARY STORAGE

Used to store programs and data for future use.
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Secondary storage is required for two reasons.
1.
The working memory of
the CPU is limited in size
and cannot always hold
the amount of data
required.
2.
Data and programs in
secondary storage do
not disappear when the
power is turned off.
DATA MEASUREMENT
BIT
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smallest unit
a short for binary digit.
represented by the numbers 1 and 0.
represent the binary system
DATA MEASUREMENT
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BYTE
a unit of information built from bits.
1 byte = 8 bits.
A byte provides enough different combinations
of 0s and 1s to represent 256 individual
characters.
One byte represents a single character such as
the number 3, letter b or a $ symbol.
DATA MEASUREMENT

KILOBYTE (KB)
In mathematics, 1 KB = 1000 bytes.
In computer, 1 KB = 1024 bytes or
can be said as:
1 KB = 210 bytes
DATA MEASUREMENT

MEGABYTE (MB)
1 MB = 1 048 576 bytes
or it can be said as:
1 MB = 220 bytes
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GIGABYTE (GB)
1 GB = 1 073 741 824 bytes
or it can be said as:
1 GB = 230 bytes